To understand how planetary systems form in the dusty disks around pre-main-sequence
stars, a detailed knowledge of the structure and evolution of these disks is required …

Context. Knowledge of the evolution of circumstellar accretion disks is pivotal to our
understanding of star and planet formation; and yet despite intensive theoretical and …

Context. It is now generally accepted that the near-infrared excess of Herbig AeBe stars
originates in the dust of a circumstellar disk. Aims. The aims of this article are to infer the …

Context. The formation and the evolution of protoplanetary disks are important stages in the
lifetime of stars. Terrestrial planets form or migrate within the innermost regions of these …

Many planets orbit within 1 au of their stars, raising questions about their origins. Particularly
puzzling are the planets found near the silicate sublimation front. We investigate conditions …

We have carried out sensitive 1.3 mm observations of 20 young brown dwarfs in the Taurus
star-forming region, representing the largest sample of young substellar objects targeted in a …

We investigate the structure and kinematics of the circumstellar disk around the Herbig Ae
star MWC 758 using high-resolution observations of the 12 CO (3–2) and dust continuum …

Context. Dust settling and grain growth are the first steps in the planet-formation process in
protoplanetary disks. These disks are observed around stars with different spectral types …

Protostellar systems, ranging from low-luminosity classical T Tauri and Herbig Ae stars to
high-luminosity Herbig Be stars, exhibit a near-infrared (NIR) excess in their spectra that is …

Context. The recent findings of gas giant planets around young A-type stars suggest that
disks surrounding Herbig Ae/Be stars will develop planetary systems. An interesting case is …